Lochinvar & A.O. Smith 100110604 Thermowell

The Lochinvar & A.O. Smith 100110604 is a professional-grade 3/4" brass thermowell engineered for high-accuracy temperature sensing in commercial and residential hydronic systems. This OEM replacement part provides a robust pressure-tight seal, allowing for the insertion and removal of temperature probes without requiring a full system drain. Constructed from corrosion-resistant heavy-duty brass, it is designed to withstand the thermal stresses of high-output boilers and water heaters while protecting sensitive sensors from direct immersion and velocity-driven wear. Utilizing a standard 3/4" NPT threaded connection, this thermowell ensures precise thermal transfer for optimized burner cycling and system efficiency. Whether you are performing routine maintenance or a full boiler overhaul, this immersion well is essential for maintaining the integrity of the sensing bulb and ensuring consistent diagnostic feedback. Compatible with a wide range of Lochinvar and A.O. Smith equipment, including specific thermostat assemblies like the 9005078205, this component is a staple for technicians requiring reliable HVAC sensor protection.

• Rapid Sensor Maintenance: Facilitates probe replacement without depressurizing or draining the hydronic loop.
• Durable Brass Construction: Offers superior corrosion resistance and longevity in potable water and closed-loop heating applications.
• Precision Thermal Response: Optimized wall thickness for fast temperature transfer to the sensing element.
• OEM Compatibility: Exact fit for Lochinvar and A.O. Smith boilers, ensuring NPT thread alignment and depth accuracy.
• Pressure Integrity: Designed to maintain a secure seal under standard operating pressures of commercial water heating systems.

Is the 100110604 thermowell compatible with standard 3/4" NPT fittings?
Yes, this unit features a standard 3/4" National Pipe Thread (NPT) for seamless integration into most boiler manifolds and storage tank ports.

Does this thermowell include the temperature sensor?
No, this is the brass immersion well housing only. It is designed to accept universal or OEM-specific temperature probes and thermocouples.

When should I replace a thermowell instead of just the sensor?
Technicians should replace the well if there is evidence of pitting, severe scaling, or threaded galling that could compromise the system's pressure seal.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.